Prepare the pie crusts and bake 15 minutes at 350 degrees. Meanwhile, heat oil in a large pot on medium-high heat. Add onion and saute until translucent. Add red pepper and saute till soft. Add ground beef and cook well. Drain and rinse. Return to pot and add tomato paste, oregano, and salt. Sprinkle on pepper and mix. Layer half of the meat mixture into the half-baked pie crusts, then cheese, then the rest of the meat mixture. Increase oven temperature to 375 degrees and bake for 25 minutes.